<template>
  <view>
    <view class="goods-list">
      <!--block标签不会被渲染为实际的内容-->
      <view v-for="(goods, i) in goodsList" :key="i" @click="gotoDetail(goods)">
        <mygoods :goods="goods"></mygoods>
      </view>
    </view>
  </view>
</template>

<script>
  export default {
    data() {
      return {
        //请求参数对象
        queryObj: {
          query: '',
          cid: '',
          pagenum: 1,
          pagesize: 10
        },
        goodsList: [],
        total: 0,
        //节流阀
        isloading: false
      }
    },
    onload(options) {
      console.log(options)
      this.queryObj.query = options.query || ''
      this.queryObj.cid = options.cid || ''
      //console.log(this.queryObj)
      tihs.getGoodsList()
    },
    methods: {
      //获取商品列表数据的方法
      async getGoodsList(cb) {
        //打开节流阀
        this.isloading = true
        const {data: res} = await uni.$http.get('/api/public/v1/goods/search', this.queryObj)
        //关闭节流阀
        this.isloading = false
        //短路运算符，cb代指回调函数，只要同时为true，关闭回调函数stopPullDownRefresh
        cb && cb()
        if(res.meta.status !== 200) return uni.$showMsg()
        
        //this.goodsList = res.message.goods
        this.goodsList = [...this.goodsList, ...res.message.goods]
        this.total = res.message.total
      },
      gotoDetail(goods) {
        uni.navigateTo({
          url:'/subpkg/goods_detail/goods_detail?goods_id=' + goods.goods_id
        })
      }
    },
    onReachBottom() {
      //判断是否没有更多数据，可以减少无效请求
      if(this.queryObj.pagenum * this.queryObj.pagesize >= this.total) return uni.$showMsg('前面的区域，以后再来探索吧')
      //节流阀开启时，执行await，和触底效果，不会二次触发该节点
      if(this.isloading) return
      //让页码值自增 +1
      this.queryObj.pagenum++
      this.getGoodsList()
    },
    onPullDownRefresh() {
      //重置关键数据
      this.queryObj.pagenum = 1
      this.queryObj.total = 0
      this.isloading = false
      this.goodsList = []
      //重新发起数据请求
      this.getGoodsList(() => uni.stopPullDownRefresh())
    }
  }
</script>

<style lang="scss">
  
</style>
